Handbook on spectrum monitoring / International Telecommunication Union
20 Anos ao serviço das rádios locais : ARIC 1991-2011, contributos para a história / J. Sousa Queirós
List of coast stations and special service stations / International Telecommunication Union
World radio TV handbook 2012 : the directory of global broadcasting / ed. WRTH Publications
The 2012 super frequency list : broadcast and utility / ed. Klingenfuss Publications
2012 Shortwave frequency guide : worldwide broadcast and utility radio stations / ed. Klingenfuss Publications
List of ship stations and maritime mobile service identity assignments / International Telecommunication Union